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atmos-aws-cloudformation

atmos-aws-cloudformation is a skill for Claude Code from cloudposse/atmos. It costs 60 tokens per session (4,929 once invoked), scanned A, original, Apache-2.0.

An experimental toolset for managing AWS CloudFormation stacks through the Atmos command line and AWS's software interface. CloudFormation is AWS's system for describing and creating cloud infrastructure as stacks.

In plain words
What is it for?
Use it to plan and apply AWS infrastructure, create or execute change sets, detect drift, manage StackSets, inspect logs and outputs, and work with S3-backed state.
Why use it?
It lets infrastructure workflows render, compare, validate, deploy, delete, and inspect stack changes without relying on separate CloudFormation command-line programs. It also supports change sets and drift checks, which show planned changes and differences from the declared setup.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the atmos plugin — 57 skills shipped together

not rated 1.4krepo +5 changed 8d ago A scan 60 tokens original Apache-2.0

Good fit Use it to plan and apply AWS infrastructure, create or execute change sets, detect drift, manage StackSets, inspect logs and outputs, and work with S3-backed state.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cloudposse/atmos/atmos-aws-cloudformation
View source ↗ cloudposse/atmos atmos.tools
About the project

Atmos is an infrastructure runtime that coordinates tools such as Terraform, OpenTofu, Kubernetes, Helm, Packer, Ansible, and containers through consistent commands and configuration. It is for teams running cloud infrastructure on laptops, in CI, or through AI agents across environments and regions. Its catalogue entries provide skills, agents, commands, and other add-ons for Atmos workflows.

cloudposse/atmos · 1,413 stars · on GitHub · atmos.tools

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add cloudposse/atmos --skill atmos-aws-cloudformation
Clone the repo
git clone --depth 1 https://github.com/cloudposse/atmos

Made for: Claude Code.

Or install atmos, the plugin that ships this one along with the rest of its 57 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for atmos-aws-cloudformation

README.md
[![agentmods](https://agentmods.dev/badge/skills/cloudposse/atmos/atmos-aws-cloudformation/github.svg)](https://agentmods.dev/skills/cloudposse/atmos/atmos-aws-cloudformation)
Your own site
<a href="https://agentmods.dev/skills/cloudposse/atmos/atmos-aws-cloudformation"><img src="https://agentmods.dev/badge/skills/cloudposse/atmos/atmos-aws-cloudformation/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for atmos-aws-cloudformation

Your own site · 80×15
<a href="https://agentmods.dev/skills/cloudposse/atmos/atmos-aws-cloudformation"><img src="https://agentmods.dev/badge/skills/cloudposse/atmos/atmos-aws-cloudformation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,929 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00060 $0.04929
Opus 5.5 $0.00024 $0.01972
Sonnet 5.5 $0.00012 $0.00986
Haiku 4.5 $0.00006 $0.00493

Measured 8d ago against content hash dec230a821e3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

atmos-aws-cloudformation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agent-skills/skills/atmos-aws-cloudformation/SKILL.md · 326 lines

How it starts

The opening of the file, as written. The whole thing — 326 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Atmos Native AWS CloudFormation Components

Use this skill for native components."aws/cloudformation" stacks. Atmos deploys them through the AWS SDK for Go v2, without an aws, cfn, sam, or Rain binary. This first aws/* component and its nested commands are experimental; the top-level aws group stays stable.

Need Load
Terraform/OpenTofu orchestration (contrast: HCL + state file vs. CFN's own stack/changeset state) atmos-terraform
Component architecture, inheritance, catalogs, dependencies.components DAG ordering atmos-components
AWS credentials / identities for the SDK client and per-target auth overrides atmos-auth
Lifecycle hooks around diff/apply/delete/drift detect/drift describe/changeset create/changeset execute atmos-hooks
Native CI job summaries atmos-ci
!secret values flowing into parameters: atmos-secrets
kind: git GitOps delivery target mechanics atmos-git
Local AWS sandbox (Floci) for testing without real credentials atmos-emulator
Migrating off Rain / raw CloudFormation atmos-migration → references/from-rain.md

Component Shape

Define CloudFormation stacks under components.aws/cloudformation in stack manifests. Prefer the unquoted aws/cloudformation: key in YAML examples; a / does not require quoting:

components:
  aws/cloudformation:
    vpc:
      path: template.yaml                    # file reference, relative to the component's base path
      stack_name: "{{ .vars.stage }}-vpc"     # explicit; no legacy name-pattern interpolation
      parameters:
        CidrBlock: "10.0.0.0/16"
        AvailabilityZones:
          - us-east-1a
          - us-east-1b
        DbPassword: !secret DB_PASSWORD       # secrets flow into parameters, not env
      capabilities:
        - CAPABILITY_IAM
      tags:
        team: platform
      stack_policy:
        file: stack-policy.json              # or an inline `body:` (JSON string or YAML map)
      role_arn: "arn:aws:iam::123456789012:role/cfn-deploy"
      termination_protection: true
      timeout_in_minutes: 30
      settings:
        aws_cloudformation:
          region: us-east-2
      provision:
        backend:
          enabled: true
        targets:
          artifacts:
            kind: aws/s3
            bucket: acme-plat-cfn-artifacts
            region: us-east-2
          gitops:
            kind: git
            repository: acme/infra-gitops
            path: stacks/dev/vpc

Read the full file on GitHub · 326 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 8d ago Changed · +2 lines dec230a821e3
  2. 18d ago Changed · -1 lines 0ee41717af26
  3. 20d ago First seen · 325 lines · 60 tokens per session scan A 4b9930d27fb8

Subscribe to this mod's changes

atmos-aws-cloudformation is a skill published in the GitHub repository cloudposse/atmos (1,413 stars, last pushed yesterday), licensed Apache-2.0. It adds 60 tokens to every session and 4,929 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-18.

CloudDevOps and cloudOrchestrationautomationclihcl2
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